Index: rrootage-0.23a/src/rr.c
===================================================================
--- rrootage-0.23a.orig/src/rr.c	2007-08-29 19:48:31.000000000 +0000
+++ rrootage-0.23a/src/rr.c	2007-08-29 19:50:14.000000000 +0000
@@ -195,14 +195,18 @@
 static int accframe = 0;
 
 static void usage(char *argv0) {
-  fprintf(stderr, "Usage: %s [-lowres] [-nosound] [-window] [-reverse] [-nowait] [-accframe]\n", argv0);
+  fprintf(stderr, "Usage: %s [-lowres|-mediumres|-highres] [-nosound] [-window] [-reverse] [-nowait] [-accframe]\n", argv0);
 }
 
 static void parseArgs(int argc, char *argv[]) {
   int i;
   for ( i=1 ; i<argc ; i++ ) {
     if ( strcmp(argv[i], "-lowres") == 0 ) {
-      lowres = 1;
+      resolution = LOW_RESOLUTION;
+    } else if ( strcmp(argv[i], "-mediumres") == 0 ) {
+      resolution = MEDIUM_RESOLUTION;
+    } else if ( strcmp(argv[i], "-highres") == 0 ) {
+      resolution = HIGH_RESOLUTION;
     } else if ( strcmp(argv[i], "-nosound") == 0 ) {
       noSound = 1;
     } else if ( strcmp(argv[i], "-window") == 0 ) {
@@ -249,6 +253,10 @@
 
   while ( !done ) {
     SDL_PollEvent(&event);
+
+    if ( event.type == SDL_VIDEORESIZE )
+      resized(event.resize.w, event.resize.h);
+
     keys = SDL_GetKeyState(NULL);
     if ( keys[SDLK_ESCAPE] == SDL_PRESSED || event.type == SDL_QUIT ) done = 1;
     if ( keys[SDLK_p] == SDL_PRESSED ) {
Index: rrootage-0.23a/src/screen.c
===================================================================
--- rrootage-0.23a.orig/src/screen.c	2007-08-29 19:50:13.000000000 +0000
+++ rrootage-0.23a/src/screen.c	2007-08-29 19:55:05.000000000 +0000
@@ -33,19 +33,37 @@
 #define LOWRES_SCREEN_HEIGHT 240
 #define SHARE_LOC "/usr/share/games/rrootage/"
 
+static Uint32 videoFlags;
 static int screenWidth, screenHeight;
 
 // Reset viewport when the screen is resized.
 static void screenResized() {
-  glViewport(0, 0, screenWidth, screenHeight);
+  int viewWidth, viewHeight;
+  if ( screenWidth * SCREEN_HEIGHT > screenHeight * SCREEN_WIDTH ) {
+    viewWidth = screenHeight * SCREEN_WIDTH / SCREEN_HEIGHT;
+    viewHeight = screenHeight;
+  } else if ( screenWidth * SCREEN_HEIGHT < screenHeight * SCREEN_WIDTH ) {
+    viewWidth = screenWidth;
+    viewHeight = screenWidth * SCREEN_HEIGHT / SCREEN_WIDTH;
+  } else {
+    viewWidth = screenWidth;
+    viewHeight = screenHeight;
+  }
+
+  glViewport((screenWidth - viewWidth) / 2, screenHeight - viewHeight, viewWidth, viewHeight);
   glMatrixMode(GL_PROJECTION);
   glLoadIdentity();
-  gluPerspective(45.0f, (GLfloat)screenWidth/(GLfloat)screenHeight, 0.1f, FAR_PLANE);
+  gluPerspective(45.0f, (GLfloat)viewWidth/(GLfloat)viewHeight, 0.1f, FAR_PLANE);
   glMatrixMode(GL_MODELVIEW);
 }
 
 void resized(int width, int height) {
   screenWidth = width; screenHeight = height;
+  if ( SDL_SetVideoMode(width, height, 0, videoFlags) == NULL ) {
+    fprintf(stderr, "Unable to create OpenGL screen: %s\n", SDL_GetError());
+    SDL_Quit();
+    exit(2);
+  }
   screenResized();
 }
 
@@ -110,7 +128,7 @@
 static GLuint titleTexture;
 #define TITLE_BMP "title.bmp"
 
-int lowres = 0;
+int resolution = MEDIUM_RESOLUTION;
 int windowMode = 0;
 int brightness = DEFAULT_BRIGHTNESS;
 Uint8 *keys;
@@ -118,11 +136,13 @@
 int joystickMode = 1;
 
 void initSDL() {
-  Uint32 videoFlags;
-
-  if ( lowres ) {
+  if ( resolution == LOW_RESOLUTION ) {
     screenWidth  = LOWRES_SCREEN_WIDTH;
     screenHeight = LOWRES_SCREEN_HEIGHT;
+  } else if ( resolution == HIGH_RESOLUTION ) {
+    /* SDL will pick the desktop resolution, which should be the highest possible */
+    screenWidth = 0;
+    screenHeight = 0;
   } else {
     screenWidth  = SCREEN_WIDTH;
     screenHeight = SCREEN_HEIGHT;
@@ -144,11 +164,14 @@
   } else {
     videoFlags = SDL_OPENGL | SDL_FULLSCREEN;
   }
-  if ( SDL_SetVideoMode(screenWidth, screenHeight, 0, videoFlags) == NULL ) {
+  SDL_Surface * screen = SDL_SetVideoMode(screenWidth, screenHeight, 0, videoFlags);
+  if ( screen == NULL ) {
     fprintf(stderr, "Unable to create OpenGL screen: %s\n", SDL_GetError());
     SDL_Quit();
     exit(2);
   }
+  screenWidth = screen->w;
+  screenHeight = screen->h;
 
   if (joystickMode == 1) {
     stick = SDL_JoystickOpen(0);
Index: rrootage-0.23a/src/screen.h
===================================================================
--- rrootage-0.23a.orig/src/screen.h	2007-08-29 19:48:31.000000000 +0000
+++ rrootage-0.23a/src/screen.h	2007-08-29 19:50:14.000000000 +0000
@@ -23,13 +23,17 @@
 
 #define DEFAULT_BRIGHTNESS 224
 
+#define MEDIUM_RESOLUTION 0
+#define LOW_RESOLUTION 1
+#define HIGH_RESOLUTION 2
+
 extern float eyeX, eyeY, eyeZ;
 extern float pitch, roll;
 extern float zoom;
 extern Uint8 *keys;
 extern SDL_Joystick *stick;
 extern int buttonReversed;
-extern int lowres;
+extern int resolution;
 extern int windowMode;
 extern int brightness;